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B} A. WALL v GRUSHING ROLL. No. 332,978. Patented Dec. 22, 1885. IF1G.1.

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UNITED STATES- "PATENT OFFICE.

ENOS A. WALL, or BULLION, IDAHO TERRITORY.

CRUSHlNG-ROLLL SPECIFICATION forming partof Letters Patent No. 332.978,dated December 22, 188 5.

' Application filed November 12, 1885. Serial No. 182,640. (No model.)

To whom it may concern.-

Be it known that I, ENos A. WALL, of-Bullion, Alturas county, IdahoTerritory, have invented an Improvement in Orushing' Rolls;

and I hereby declare the following to be a full,

clear, and exact description of the same.

My invention relates to that class of crushing-rolls consisting of ironor steel shells upon rotating shafts, and forming a portion of a.machineoommonly known as Cornish rolls.

My invention consists in certain details of construction and combinationof parts, all of which I shall hereinafter fully claim and de scribe byreference to the accompanying drawr5 ings, in which-- Figure 1 is a planof a machine embodying my improvements. Fig. 2 is a diagram or outlineof the cross-section of one of the rolls.

' Fig. 3 is a perspective view of one-half of the shield M.

The principle usually applied in machines of thisclass heretofore in usefor the crushing of ores of quartz and other hard substances isdefective, chiefly in the construction of the outer or crushing surfacesof the cast-iron or steel shells. These shells are made round or flutedand of varying thicknesses, of from two and a half to six inches, thediameter being from one-third to two-fifths greater than the length.They are placed upon rotating shafts and are made to rotate in oppositedirections, being adjustable as to space, between the adjacent sides,according to the size to which the material is desired to be reduced.

In crushing hard substancessuch as quartz and metal-bearing ores-it isfound that the crushing-surfaces at once begin to wear in parallelgrooves around the shell, thus forming a series of channels into whichthe ore or other material naturally drops and continues to wear thechannels or grooves deeper and wider, and consequently renders theproduction of a uniform pulp impossible and the shells valueless, evenbefore one-third thereof 5 has been worn off. This can be corrected, toa certain extent, by corrugating or fluting the surfaces of the shellsor rolls; but unless certain relative proportions between thecorrugations or ribs and the diameter and circumference of the roll beprovided for the wear is not properly equalized.

, faces of these shells, instead of being smooth,

It is the object of my invention to provide rolls with surfaces adaptedfor the most effective crushing, and which will wear equally ries thegear F, meshing with the pinion D. On

its other end is a gear, G, meshing with a gear, G, on the other shaft,whereby said shafts rotate in opposite directions. Upon these shafts E Eare the crushing-rolls H, which consist of shells of iron, steel, orother metal compound, secured in suitable manner. The sur- 7o as issometimes the case, or instead of being corrugated or fluted, withoutreference to'the maintenance of certain proportions, are in my machineformed with corrugated or fluted intermeshing surfaces, the ribs orelevations of which and the corresponding grooves or depressions arearranged in a spiral or inclined course or direction, as shown, those onone roll being oppositely inclined to those on the other, said ribs orcorrugations bearing certain proportions in their depth and thickness attheir bases to the diameter and circumference of the rolls, as Ishallnow describe.

I am aware that spirally grooved or fluted rolls are not broadly new,the same being found in the Parrott patent, No. 28,499, dated May 29,1860.

In my improved rolls the depth of each rib or corrugation should beabout one-tenth of the diameter of the roll or shell. The thick- 0 nessat the base of the rib or corrugation should be about one-sixth of thecircumference of the shell, taken on a line or curve passing throughpoints in the rib distant from its end about one-third of its depth, andthe depth of 5 the rib should be about one-sixth of its thickness at thebase. This matter of proportions I deem of great value, for thefollowing reasons: I have found from experience that when theseproportions are adopted'and the rolls r00 subjected to an even wear ofsurface their ribs or corrugations will at all times maintain the samerelative proportions to each other and to the remainder of the shell orroll. As the surfaces wear away the corrugations will maintain theirusefulness until the axis of the roll is reached. This result could notbeachieved if the ribs or corrugations were of greater or less depth orthickness; or, inother words, if

the depth and thickness bore a different relathe principle.

On the ends of one of the roller-shafts are 7 the shields or guardplatesM. These are fixed rigidly to the shaft and rotate with it. They areseparated from the ends of the roll by means of pieces m, and they areof larger diameter than the roll, whereby they span the space betweenthe two rolls and overlap slightly the ends of the opposing roll.

Iarn aware that these shields or guard-plates are not broadly new; butin order to provide for the ready application of these shields orguard-plates I make them in halves, fitting.

them over the shaft, and having their meeting edges turned at an angleand bolted together, as shown at m. The effect of these shields is toprevent the material being crushed from falling over the ends of therollsa result which is very liable to happen with the splrally-arrangedcorrugations, as described. As these shields rotate with the rollers,allwear is obviated, and by projecting only a short distance 'above therolls the feed may be dropped upon them close to the surface, thusavoiding the scattering of the ore after it has left the feed trough ortable, and insuring an equal distribution of the material.

The intervention of the pieces m provides suflicient space for theshields to overlap the opposing roll.

Having thus described my invention,whatI claim as new, and desire tosecure by Letters Patent, is-

1. The combination of the two oppositely rotating crushing-rolls H,having corrugated or fluted intermeshing surfaces, the ribs and groovesof which are arranged on the rolls oppositely andin a spiral or inclinedcourse or direction, said ribs or corrugations being in depth about onetenth of the diameter of the rolls, and about one-sixth of the thicknessof their own bases, andin thickness at their bases about one-sixth ofthe circumference of the rolls, taken on a line or curve passing throughthe ribs at points about one-third of their length from their ends,substantially as herein described.

2. In combination with the oppositely rotating crushing-rolls H, havingthe spirallyarranged corrugated or fluted and intermeshing surfaces, therotating shields or guardplates M at the ends of one of the rolls, andoverlapping slightly the ends of the other,said shields or guard-platesconsisting of halves fitted on the roll-shaft and having angled flangesat their meeting edges secured by bolts, substantially as hereindescribed.

In witness whereof I have hereunto set my hand.

ENOS A. WALL.

Witnesses:

E. A. GUNSEN, G. L. Havens, Jr.

